Implement support for TransformationSystem using RucioFileCatalog

This is currently not supported by DIRAC and needs changes there.

The missing method (and one that is not really possible to implement) is

src/DIRAC/TransformationSystem/DB/TransformationDB.py
1708:        res = catalog.getMetadataFields()

as Rucio doesn't have a fixed metadata schema, there is not really a way to implement this method.

So it needs deeper changes in DIRAC.

See also: https://github.com/DIRACGrid/DIRAC/issues/8331, https://github.com/DIRACGrid/DIRAC/issues/8329